46 Configuration and Calibration Guide HD0679 Rev 1.2.0
1.5
Symptom: Inconsistent or Erratic Readings That Do Not Track
Moisture Content
Possible
explanation
Check
Required result
Action required on
failure
Debris on sensor
Debris, such as
cleaning rags
hanging over sensor
face
The sensor must
always be kept clear
of debris
Improve material
storage. Fit wire
mesh grids to tops of
bins and mixer
loading ports.
Material ‘stuck’ in bin Material is stuck
above sensor
A smooth flow of
material over the face
of the sensor when
gate is open
Look for causes of
erratic flow of
material. Reposition
sensor if problem
continues
Build-up of material
on sensor face
Signs of build-up
such as dried solid
deposit on ceramic
face
Ceramic face should
always be kept clean
by the action of the
material flow
Change angle of the
ceramic in range 30°
to 60°. Reposition
sensor if problem
continues
Inappropriate
calibration
Ensure calibration
values are
appropriate to
working range
Calibration values
spread throughout
range avoiding
extrapolation
Perform further
calibration
measurements
Ice forming in
material
Material temperature
No ice in material
Sensor will not
measure in ice
Average/Hold signal
is not in use
Control system is
calculating batch
average readings
Average moisture
readings must be
used in batch
weighing applications
Modify control
system and/or
reconfigure sensor as
required
Incorrect use of
Average/Hold signal
Average/Hold input is
operating during the
main flow of material
from the bin
Average/Hold should
be active during main
flow only – not during
jogging period
Modify timings to
include main flow and
exclude jogging from
measurement.
Inappropriate sensor
configuration
Operate the
Average/Hold input.
Observe sensor
behaviour
The output should be
constant with
Average/Hold input
OFF and changing
with the input ON
Sensor output
configured correctly
for the application
Inadequate ground
connections
Metalwork and cable
ground connections
Ground potential
differences must be
minimised
Ensure equipotential
bonding of metalwork
Содержание Hydro-Mix
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Страница 14: ...Chapter 1 Introduction 14 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Страница 28: ...Chapter 2 Configuration 28 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Страница 40: ...Chapter 3 Sensor Integration and Material Calibration 40 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Страница 42: ...Chapter 4 Best Practices 42 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Страница 48: ...Chapter 5 Sensor Diagnostics 48 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
Страница 52: ...Appendix A Document Cross Reference 52 Configuration and Calibration Guide HD0679 Rev 1 2 0 ...
